Exodus 28:39-42

39“You shall weave the tunic of checkered work of fine linen, and make a turban of fine linen. You shall make a sash, the work of an embroiderer.

40“For Aaron’s sons you shall make tunics and sashes and [ornamental] caps, for glory and honor and beauty.

41You shall put the various articles of clothing on Aaron your brother and on his sons with him, and shall anoint them and ordain and sanctify them, so that they may serve Me as priests.

42You shall make for them [white] linen undergarments to cover their bare flesh, reaching from the waist to the thighs.